Yes, your referenced link WAS a general comment regarding mobi and epub, which has evolved a lot in the last two years.
I imagine this book, since it's from CUP, will be available as a Kindle purchase if not now then very soon. I've been purchasing textbooks for the Kindle for awhile now. My only complaint is typically the equations are included as images, so they can be very small.
How I wish MathML were a standard for academic publishing.